Re: Recommendation for prototype CM (BGA reflow, mainly)


> Just a steel plate with 25mm x 25mm square hole. I am thinking about
> the same. Unfortunately, mime is 35mm x 35mm; otherwise, we could
> share the stencil.

You would use one of the self-adhesive BGA template things inside that
hole?

> > these chips are $30 each (the PCBs are $175 each). I really want them
>
> That's expensive, even if you have 10 layers. Are you counting setup
> costs?

175 is for the protos, which are just going to be made in 4-off (3 to
be stuffed, one to buzz out problems). It's an 8-layer board. In
production it would be much cheaper of course but I have to assume at
least one spin between proto and production.

> By the way, in productions, would you be mounting the BGA first, or
> last? I am thinking about mount it last, but the stencils are more
> tricky to make.

This is the kind of detail I would expect a CM to solve; if I contract
out assembly, they would make the stencil(s) and handle the details of
that nature.

.